Marvel Studios has postponed the launch on Black Widow due to the outbreak of Novel Coronavirus. It was originally scheduled to release on May 1, in the US. Marvel did not announce any new dates yet.
The movie sets between the events of Captain America: Civil War and the Avengers: Infinity War. The trailer looks very promising. The trailer shows Black Widow tired of running from her past and she wants to fight it.
Black Widow is the beginning of Marvel Phase 4. It will be the first movie of the Phase Four Marvel Cinematic Universe movies. It will be followed by another Marvel supernatural “The Eternals.”